package map;

import java.util.*;
public class MapDemo2 {
    public static void main(String[] args) {
        Map<String,Integer> map = new HashMap<>();
        map.put("语文",98);
        map.put("数学",97);
        map.put("英语",96);
        map.put("物理",95);
        map.put("化学",98);
        Set<String> keySet = map.keySet();
        for(String key : keySet){
            System.out.println("key:"+key);
        }
        Set<Map.Entry<String,Integer>> entrySet = map.entrySet();
        for(Map.Entry<String,Integer> e :entrySet){
            String key = e.getKey();
            Integer value = e.getValue();
            System.out.println(key+":"+value);
        }
        Collection<Integer> values = map.values();
        for(Integer value :values){
            System.out.println("value:"+value);
        }

        Collection<String> c = new ArrayList<>();
        c.add("one");
        c.add("two");
        c.add("three");
        c.add("four");
        c.add("five");
        for(String e :c){
            System.out.println(e);
        }
        c.forEach(
                e-> System.out.println(e)
        );
        map.forEach(
                (k,v)-> System.out.println(k+":"+v)
        );

    }
}





